Am I anorexic???????????????

Okay, I'm over weight, jsut putting that out there, and I have been on a healthy diet for the past 2 months, and have been working out. Now, about a week and a half ago I began taking a new ADHD med, Vyvanse, and it took away my apetite and I think it sped up my metabolism. I've been eating only 700 calories or less a day, and burning about 500. It's not even been 2 weeks, but I've nearly lost ten pounds already, and my friends are becoming concerned that I'm doing this to myself and it's not the medicine. The medicine really works, and I don't want to be taken off it because it's the only med thats helped me focus so much. What do I do?